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