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