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