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