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