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