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