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