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