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