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