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