As the World Turns and The Guiding Light both premiered in the 50's and did not go into color until 1967. It has been believed, but not confirmed that TGL may have broadcast a color episode on the CBS color system.
Here's a link to see old and current soap opera (still on and cancelled from here and abroad) titles and some full episodes.
www.wost.org
You need a high speed connection to view the videos.