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)(12,15)(13,16)(17,18,21,23)(19,24,28,31)(20,29,27,25)(22,26,30,32)(9,11,14,10)(12,15,13,16)(18,23)(19,27)(20,28)(22,30)(24,29)(25,31)(2,5)(6,8)(9,12,14,13)(10,15,11,16)(17,19)(18,24)(20,22)(21,28)(23,31)(25,32)(26,29)(27,30)(1,3,4,7)(2,6,5,8)(9,13,14,12)(10,15,11,16)(18,23)(24,31)(25,29)(26,32)(17,20,21,27)(18,25,23,29)(19,22,28,30)(24,32,31,26)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.