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