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