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