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