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