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