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