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