Showing thumbnails on related post in page

Hello guys,

I want to show thumbnail in related post. I’ve made page template using this code below.

http://travelingwithkids.com.au/about-bali

<div class="related-post">
<h2>here is latest post about bali</h2>
<?php
$catquery = new WP_Query( 'cat=2&posts_per_page=4' );
while($catquery->have_posts()) : $catquery->the_post();
?>

<ul>
<li>
<h3><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h3>
</li>
</ul>
<?php endwhile; ?>
</div>

P.S. I’m using Genesis framework.

Any help?

Thanks in advance.

Shohag