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