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