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