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