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