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