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