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