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