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