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