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