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)(15,23)(16,20)(17,21)(18,22)(19,24)(25,27)(26,28)(5,6)(7,11)(8,10)(9,12)(13,15,17,24,18,25,16,26)(14,19,20,23,22,28,21,27)(2,4)(5,7)(6,9)(8,12)(10,11)(13,16,18,17)(14,20,22,21)(15,24,25,26)(19,27,28,23)(7,12)(9,11)(15,24)(16,17)(19,23)(20,21)(25,26)(27,28) involution — undirected(6,10)(9,11)(13,16,18,17)(14,21,22,20)(15,24,25,26)(19,23,28,27)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.