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