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