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