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)(11,14)(12,13)(15,16)(17,18,23,25)(19,26,21,22)(20,24,29,31)(27,32,28,30)(2,5)(6,8)(17,19,22,18,23,21,26,25)(20,27,30,24,29,28,32,31)(10,13)(14,16)(17,20,23,29)(18,24,25,31)(19,27,21,28)(22,30,26,32)(1,3,4,7)(2,6,5,8)(17,21,22,25,23,19,26,18)(20,28,30,31,29,27,32,24)(9,11,12,15)(10,14,13,16)(20,29)(24,31)(27,28)(30,32)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.