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