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