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