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