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