Even in my high school classroom I use seat numbers and assign each student a job. This download is linked to my Group Binder Download, but can be used independently. There is also an all inclusive bundle that you can download as well.
This particular bundle includes:
-6 color coded job groups
-6 different jobs within each color group
This is a PDF version. If you want the editable version, it is available for $2.00 more.