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