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