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