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