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)(15,23)(16,22)(17,20)(18,21)(19,26)(24,28)(25,27) involution — undirected(1,2)(3,4)(6,9)(10,11)(13,15)(14,19)(16,26)(17,24)(18,25)(20,27)(21,28)(22,23) involution — undirected(14,20)(15,24)(17,18)(21,22)(25,26)(27,28) involution — undirected(2,4)(14,21)(15,25)(17,18)(20,22)(24,26)(27,28) involution — undirected(5,7,8,12)(6,10,9,11)(14,22)(15,26)(20,21)(24,25)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.