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