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