Use Shapes and Capital/Lowercase Letters
Some LSAT games will have two different types of elements -- adults/children, men/women, and so on. To separate these elements, utilize different shapes plus capital and lowercase letters for each. Consider LSAT PrepTest 47, Game #4. You could separate the supervisors from the regular employees like this:

Note: When using capitals and lowercase letters, ensure that you overemphasize the capital letters as shown in the example.
You may now incorporate these shapes into your LSAT game diagram. We must have exactly two employees each day, at least one supervisor each day, and have Ophelia on Tuesday and Wednesday, and will symbolize these on the diagram as such: