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