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