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