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