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