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