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