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