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