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