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