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