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