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