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