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