Nice image there, but I wouldn't use Hubble as a source of colour accuracy for the planets. The Hubble filters were chosen for photographing DSOs, so the wavelength response bears little resemblance to white light viewing such as what reflects off the planets from the Sun.
Instead, the images from the Cassini spacecraft are more "accurate" since the filters in its camera are set to capture the full solar spectrum (and then some), and NASA have gone to some trouble to produce "natural looking" colours of Saturn. Oh, and Saturn's rings aren't white!
Here is a link to some images of Saturn from Cassini, and a link to the article that describes the filters used on its cameras (see figure 20).
https://solarsystem.nasa.gov/news/12...0-images-2016/
https://web.archive.org/web/20190715...ingScience.pdf
Andrew