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