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