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