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