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