This Liquid loop for Jekyll loops through a defined category of your choice. Use this code-snippet as an include

loop-category.liquid

{% comment %}
*
*  This loop loops through a category of your choice and lists
*  all entries. To address the category of your linking use the
*  include like this:
*
*  {% include loop-category category='webdesign' %}
*
{% endcomment %}

{% for entry in site.categories[include.category] %}
<li><a href="{{ site.url }}{{ site.baseurl }}{{ entry.url }}" title="{{ entry.title | escape }}">{{ entry.title }}</a></li>{% endfor %}