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