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