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