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