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