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