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)(11,12)(13,15)(14,16)(17,18,21,24,20,23,25,31)(19,22,27,30,26,29,28,32)(9,11,12,10,14,15,13,16)(17,19,25,27,20,26,21,28)(18,22,24,32,23,29,31,30)(2,5)(6,8)(9,12,14,13)(10,15,16,11)(18,23)(22,29)(24,31)(30,32)(1,3,4,7)(2,6,5,8)(9,12,14,13)(10,11,16,15)(18,23)(19,26)(24,31)(27,28)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.