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