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)(15,20)(16,19)(17,26)(18,21)(22,25)(23,27)(24,28)(2,3)(13,15,18,25)(14,20,21,22)(16,23,26,28)(17,24,19,27)(1,2,4,3)(6,9)(10,12)(13,16,18,26)(14,17,21,19)(15,22,25,20)(23,24,28,27)(1,3,4,2)(13,14)(15,23)(16,17)(18,21)(19,26)(20,27)(22,24)(25,28)(5,7,8,11)(6,10,9,12)(13,17,18,19)(14,16,21,26)(15,24,25,27)(20,23,22,28)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.