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