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