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