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