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)(11,12)(13,15)(14,16)(17,18,22,19)(20,23,27,25)(21,26,29,24)(28,31,32,30)(2,5)(3,7)(9,11,14,13)(10,12,16,15)(17,19,22,18)(20,23,27,25)(21,24,29,26)(28,31,32,30)(9,12,11,10,14,15,13,16)(17,20)(18,23)(19,25)(21,28)(22,27)(24,30)(26,31)(29,32)(1,3,4,7)(2,6,5,8)(20,27)(23,25)(28,32)(30,31)(9,11,14,13)(10,15,16,12)(17,21,22,29)(18,24,19,26)(20,28,27,32)(23,30,25,31)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.