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