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