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