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