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)(14,20)(15,23)(17,19)(21,28)(24,25)(26,27)(5,7)(6,9)(8,12)(10,11)(13,14,18,20)(15,24,27,21)(16,19,22,17)(23,28,26,25)(6,10)(9,11)(13,15,17,26,18,27,19,23)(14,21,16,28,20,24,22,25)(7,12)(9,11)(13,16,18,22)(14,17,20,19)(15,25,27,28)(21,23,24,26)(1,3,4,2)(6,10)(9,11)(13,17,18,19)(14,22,20,16)(15,26,27,23)(21,25,24,28)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.