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