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