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