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