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