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