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