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