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