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)(19,28)(20,25)(21,31)(22,27)(23,26)(24,30)(29,32) involution — undirected(2,5)(6,7)(9,11)(10,13)(12,15)(14,16)(17,19,22,30)(18,24,27,28)(20,21,29,23)(25,26,32,31)(10,14)(11,15) involution — undirected(10,14)(13,16)(17,20,23,19,22,29,21,30)(18,25,26,28,27,32,31,24)(1,3,4,8)(2,6,5,7)(17,21,22,23)(18,26,27,31)(19,29,30,20)(24,32,28,25)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.