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