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