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