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