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