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