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