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