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