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