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