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)(19,27)(20,26)(21,25)(22,24)(23,28)(29,31)(30,32) involution — undirected(1,2,4,5)(3,7,8,6)(10,13)(11,15)(17,19)(18,23)(20,30)(21,28)(22,29)(24,32)(25,27)(26,31)(9,10)(11,14)(12,13)(15,16)(18,24)(19,28)(20,22)(23,31)(25,26)(27,32) involution — undirected(1,3,4,8)(2,6,5,7)(10,13)(14,16)(17,20,21,22)(18,24,25,26)(19,29,28,30)(23,31,27,32)(9,11,12,15)(10,14,13,16)(19,28)(23,27)(29,30)(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.