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