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