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