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