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