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)(15,19)(16,18)(17,20)(21,22,25,27)(23,26,24,28)(5,6)(7,8)(9,11)(10,12)(13,14,18,16)(15,19,17,20)(21,23,25,24)(22,26,27,28)(2,3)(5,7,9,12)(6,10,11,8)(13,15,18,17)(14,19,16,20)(21,22)(23,26)(24,28)(25,27)(1,3,4,2)(5,7)(6,8)(9,12)(10,11)(13,16,18,14)(15,19,17,20)(21,24,25,23)(22,26,27,28)(5,8)(6,7)(9,10)(11,12)(13,17,18,15)(14,19,16,20)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.