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