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)(11,13)(12,14)(15,16)(17,18,23,27)(19,20,28,31)(21,25,22,26)(24,29,32,30)(2,5)(6,8)(9,11,12,15)(10,13,14,16)(17,19,23,28)(18,20,27,31)(21,24,22,32)(25,29,26,30)(1,3,4,7)(2,6,5,8)(13,16)(17,20)(18,24)(19,26)(21,29)(22,30)(23,31)(25,28)(27,32)(2,5)(6,8)(17,21,23,22)(18,25,27,26)(19,24,28,32)(20,29,31,30)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.