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