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