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