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