Rudy, this is a fairly new feature in the Facility Scheduler, so if you don't have version 8, you can upgrade to get this feature. If you already have version 8, then go to the Facilities screen, and click on "Default Color" in the left menu. In the list of colors, the ones at the top deal with a lighter font color on a colored background, but if you scroll down, you can set the color of the font to red text or blue text, etc. You can also set a few font styles if you're interested in that - like bold or italics.
When you schedule events, events scheduled in that facility will default to that color. However, you can change the color and font style for individual events if you wish to.
Note: Changing the Facility font color only affects events scheduled from then on - it will not affect events you have already scheduled.