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