What does the peacock represent in greek mythology?

Greek myth:
Zeus was having an affair with the nymph Io. Hera, Zeus's wife, found out about it. Zeus changed Io into a white heifer. Hera sent her servant Argus to watch the cow. Argus had one hundred eyes, and when he slept some of them were always open, so he could see in his sleep. Zeus sent Hermes to save Io. Hermes played a lullaby on his Flute, and as each of Argus's eyes shut, Hermes touched it with his magic wand and sealed it shut. Finally all of Argus's eyes were shut, and the cow ran away (according to some legends all the way to Egypt, but that's another story). Hermes killed Argus, and Hera, to honor Argus put the eye pattern on the peacock's tail forever.