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