If you look around campus, you'll see people from all walks of life. Interestingly enough, however, white students say the campus is very diverse, but students of color say it's not as diverse as it could be. The demographic makeup makes some students feel like outsiders, and it's not unusual to see clusters of whites, clusters of blacks, clusters of Asians, and so on. Of course, that's not to say that there's no social intermixing of races (there most certainly is), just that, quite frequently, people congregate with those who look like themselves. Everyone gets along, though, so you won't feel unsafe because of your race.
The city of Sacramento is an incredibly diverse urban area. Sacramento is representative of the state of California because it's home to people of numerous ethnicities. Also, when the word "diverse" comes up, most people think along color lines, but it also applies to age and gender, and Sac State is quite diverse along those lines as well. Female students outnumber male ones, and older students are a visible presence on campus. Because it's a commuter school, several students already have full-time jobs, families, or previous degrees. The larger concentration of students above their early-20s who live off campus is part of the reason why campus culture isn't quite as unified as it could be. After all, how much do you think a 30-something working professional cares about the latest campus football game? Not as much as a lot of the 19-year-olds-not usually.