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