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