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