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