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