There is no setting to change the color of the pencil, but you could change the color by overriding it in your CSS.
Or you could just put this snippet to you function.php and change the color to whatever you like.

function cac_better_visible_inline_edit_icon() { ?>
	<style type="text/css">

		#the-list.cacie-enabled td .cacie-edit,
		#the-comment-list.cacie-enabled td .cacie-edit {
			color: #000; // black color
		}
		
	</style>
	<?php
};
add_action( 'cac/admin_head', 'cac_better_visible_inline_edit_icon' );