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