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