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