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