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