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