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