With the community ed, there isnt a way to setup different ACLs for separate groups via the web interface. You can only set groups to go through the content filter, and AV filter. However have a look at this:
Squid Custom ACLs
http://alumnus.caltech.edu/~igormt/endian/extras.htmlHavent had time to try yet but looks like what you want.
It really looks like, but the thing is that it doesn´t appear anywhere in the interface. The author´s page does not exist anymore. It should be great if we could assign different rules for different groups, nothing fancy.... it´s a pitty!
PS.: I´ve found this:
http://.itlinux.cl/pbruna/?p=6 (the author's page updated)