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