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