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