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