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