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