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