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)(13,14,19,22)(15,20,18,16)(17,21,26,28)(23,27,25,24)(5,7)(6,9)(8,12)(10,11)(13,15,19,18)(14,20,22,16)(17,23,26,25)(21,27,28,24)(6,10)(9,11)(13,16,18,14,19,20,15,22)(17,24,25,21,26,27,23,28)(7,12)(9,11)(13,17,19,26)(14,21,22,28)(15,23,18,25)(16,24,20,27)(1,3,4,2)(6,10)(9,11)(13,15,19,18)(14,20,22,16)(17,25,26,23)(21,24,28,27)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.