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