As stated earlier, there is a difference between cussing outloud and cussing a player. Some of the greatest Coaches of all time were known to use a few at selected times: Bear Bryant, Johnny Majors, Joe Paterno, Steve Spurrier are just a few that I have heard use a few curse words.
There are also some very successful coaches that do not use curse words. Bud Grant, was one. My Coach at Maryville College, Phil Wilks, would not allow his coaches to use foul language.
It really depends on the coach and the players. Also geography has a little to do with it. I know in the North and Eastern USA, the words considered "cuss" words in the South are used more frequently.