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