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