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