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