Page for custom post type category

Hello,
I made an custom post type in my blog someday ago. Now I want to make a different page style for the category (actually it’s use the same as the normal posts).

I search, but didn’t found anyway to do that, looks like isn’t the same thing as the single.php (that you cam make ‘custompost-single.php’. The only way I found is making an page template for it, and in the loop get only the category from custom post type.

In the logic, it’s ok, but I didn’t understand how to make it works. I stop in something like this:

<?php query_posts("post_type=biblioteca&cat=2131"); ?>

What the right way, anyone?