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