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