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you haven't stated where the category id will come from, nor how you want to style the category title, and if the post titles are supposed to be linked to the single post; therefore just the basic structure:

<?php 
$cat_id = 137; 
    echo get_category($cat_id)->name;
    $cat_posts = get_posts(array('category__in' => array($cat_id), 'posts_per_page' =>5));
    if($cat_posts) {
        echo '<ul>';
        foreach($cat_posts as $cat_post) {
            echo '<li>'.get_the_title($cat_post->ID).'</li>';
        }
        echo '</ul>';
    }
?>