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