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