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