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