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