Passing get_users attributes to shortcode atts

Hello,

I built the following function to show a list of my users based on the parameters set in the get_users array. And it works.

$blogusers = get_users( array(
		'role' => 's2member_level4',
		'order'        => 'ASC',
		'orderby'      => 'meta_value',
		'meta_key' => 'last_name',
		'include' => array(),
		'exclude' => array(745),
		'meta_query' => array(
			'key' => 'wp_s2member_custom_fields',
			'value' => 'Senior Management',
			'compare' => 'LIKE'
		)
) );

foreach ( $blogusers as $user ) {
	$s2user = get_user_meta( $user->ID, 'wp_s2member_custom_fields', true );
	$department = get_user_field('gs_department', $user->ID);
	echo '<div class="stafflisting staff-'.esc_html($user->ID).'">';
	echo get_wp_user_avatar($user->ID);
	echo '<strong style="text-transform: uppercase;">' . esc_html( $user->last_name ) . '</strong> ';
	echo esc_html( $user->first_name ) . '<br />';
	if(qtrans_getLanguage()=='en'):
	echo '<div class="user_meta">' . $s2user['gs_title_eng'] . '</div>';
	endif;
	if(qtrans_getLanguage()=='de'):
	echo '<div class="user_meta">' . $s2user['gs_title_de'] . '</div>';
	endif;

		if(is_array($department)) {
			echo '<div class="dept user_meta">';
			if(qtrans_getLanguage()=='en'):
				echo 'Dept: ';
			endif;

			if(qtrans_getLanguage()=='de'):
				echo 'Abt: ';
			endif;

		foreach($department as $value)
				$value = reset ($value);
				$department = implode(' / ', $department);
				echo $department;
		};

	echo '</div>';
	echo '<div class="user_contact">';

	echo '<a href="mailto:' . esc_html( $user->user_email ) . '"><i class="fa fa-envelope-o" aria-hidden="true"></i> Email</a></div>';
	if (($s2user['gs_direct_line'])!==null) {
		echo 'Direct Line: ' . $s2user['gs_direct_line'];
	};
	echo '</div>';
}

What I would very much like to do is convert this into a shortcode in which I could pass the get_users array to the shortcode atts, such as

[userdata role="s2member_level4" order="ASC" orderby="meta_value" meta_key"last_name"]

and so far I have not succeeded.

Here is the code that I am testing one or two fields with, which does not work. The specified atts in the shortcode, like in the example above, are not picked up.

function getUserData_func( $atts ) {
    $user_info = get_users( $atts[array(
		'role' => 's2member_level4',
		'order' => 'ASC',
		'orderby' => 'meta_value',
		'meta_key' => 'last_name',
		'include' => array(),
		'exclude' => array()
	)]);

	foreach ( $user_info as $user ) {
	echo '<strong style="text-transform: uppercase;">' . esc_html( $user->last_name ) . '</strong> ';
	echo esc_html( $user->first_name ) . '<br />';
}
}
add_shortcode( 'userdata', 'getUserData_func' );

Can anyone point me in the right direction?

Very much appreciated.