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