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