gistfile1.txt

<?php
add_action( 'admin_head-edit-tags.php', 'baw_admin_enqueue_styles' );
function baw_admin_enqueue_styles() {

	global $taxnow;
	if ( 'category' != $taxnow ) {
		return;
	}

	add_action( 'admin_head',   'baw_term_colors_print_styles' );
}

function baw_term_colors_print_styles() {
	?>
	<style type="text/css">
		.column-color { width: 50px; }
		.column-color .color-block { display: inline-block; width: 28px; height: 28px; border: 1px solid #ddd; }
	</style>
<?php
}