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