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