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