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