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