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