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