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