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