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