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