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