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