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