Nice photo, Trevor, but maybe clipped at the black end with the sky background pretty dark as has been mentioned. My visual memory of that bright star on the edge of the cluster is that it's distinctly orange. Maybe a little more saturation in the star colours?
I hadn't ever heard of the "wishing well" name for NGC3532. A quick web search shows it was made up by amateur Ray Palmer in 2006 as a personal whim to popularise the cluster.
http://www.ngc3532.com/idea.htm