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