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