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