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