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