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