Show Custom Taxonomies from ALL Custom-post-types on index.php

How do I list all custom taxonomies(categories) on index, it seems NOT to show on index.. But only on custom-post-types / archives

Here is my code for custom post types:

<?php $terms = get_the_terms( $post->ID , 'genre' );
foreach ( $terms as $term ) {
	echo '<a style="margin-left:5px" href="';
	echo get_term_link( $term );
	echo '">';
	echo $term->name;
	echo '</a>'; } ?>