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)(11,13)(12,14)(15,16)(17,18)(19,27)(20,26)(21,23)(22,25)(24,30)(28,31)(29,32) involution — undirected(1,3,4,8)(2,5,6,7)(9,11,12,16)(10,13,14,15)(18,23)(24,31)(25,26)(27,32)(9,10)(11,15,16,13)(12,14)(17,19,22,30,21,29,20,28)(18,24,26,27,23,31,25,32)(2,6)(5,7)(17,20,21,22)(18,25,23,26)(19,28,29,30)(24,32,31,27)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.