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