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