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