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