Here's a handy Hong Kong MTR map that I found online. Keep in mind that, in Hong Kong, "subway" can mean the MTR or an underground passage for crossing the street. A lot of MTR stations are actually both. Some stations come up in several different blocks. Be sure to look for the MTR logo.
I borrowed this image from someone who borrowed it from someone who borrowed it... It looks like it originally came from "China Hightlights"