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