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