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