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