How can I make different page templates for one category?

Make 1 template, and do a conditional on the meta info to either include a different stylesheet, or a entire different file altogether.

$colour = get_post_meta(the_ID(), 'color');
switch($color) {
     case 'red':
         include('category-car-red.php'); // or just different CSS
         break;

     case 'green':
         include('category-car-green.php'); // or just different CSS
         break;
     // etc
}