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