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)(13,14,17,21,18,22,19,15)(16,20,25,28,24,27,26,23)(2,4)(13,14)(15,17)(16,23)(18,22)(19,21)(20,26)(24,28)(25,27) involution — undirected(6,9)(10,12)(13,15,17,14,18,21,19,22)(16,23,25,20,24,28,26,27)(13,16,19,26,18,24,17,25)(14,20,15,23,22,27,21,28)(5,7,8,11)(6,10,9,12)(16,24)(20,27)(23,28)(25,26)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.