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