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