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