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