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