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