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