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