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