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