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