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