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