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