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