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