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