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