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