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