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