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