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