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