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