The readings listed here include Torah, Haftarah, and Megillot (where appropriate). You can download both sound files in mp3 format and text files in pdf format.
Shabbat Chol HaMoed Day 1 (Note: The maftir will change depending on which Chol HaMoed. The other aliyot and the haftarah are the same for all Shabbat Chol HaMoeds)