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