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