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