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