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