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