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