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