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