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