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