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