One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,13,15)(11,14,12,16)(17,18,23,27)(19,28,30,25)(20,29,31,21)(22,32,24,26)(2,5)(6,8)(9,11,13,12)(10,14,15,16)(17,19,23,30)(18,25,27,28)(20,26,31,32)(21,22,29,24)(9,12,13,11)(10,14,15,16)(17,20,22,25,23,31,24,28)(18,21,32,30,27,29,26,19)(17,21,24,19,23,29,22,30)(18,20,26,28,27,31,32,25)(1,3,4,7)(2,6,5,8)(17,22,23,24)(18,26,27,32)(19,29,30,21)(20,25,31,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.