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)(13,14,16,19)(15,18,21,26)(17,20,24,28)(22,25,23,27)(2,3)(6,10)(11,12)(13,15,16,21)(14,18,19,26)(17,22,24,23)(20,25,28,27)(1,2,4,3)(5,7,9,8)(6,11,10,12)(14,19)(15,21)(20,28)(22,23)(1,3,4,2)(5,7,9,8)(6,11,10,12)(15,22)(17,24)(18,25)(20,28)(21,23)(26,27)(5,8,9,7)(6,11,10,12)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.