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