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