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