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