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