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