One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(10,13)(11,15)(17,18,24,31,23,28,22,27)(19,29,30,25,20,21,26,32)(1,3,4,7)(2,5,6,8)(10,13)(11,15)(17,19,23,20)(18,25,28,32)(21,31,29,27)(22,30,24,26)(2,6)(5,8)(9,10)(11,14)(12,13)(15,16)(17,20,23,19)(18,21,28,29)(22,30,24,26)(25,31,32,27)(10,13)(14,16)(17,21,24,32,23,29,22,25)(18,26,31,19,28,30,27,20)(9,11,12,15)(10,14,13,16)(17,22,23,24)(18,27,28,31)(19,30,20,26)(21,32,29,25)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.