Titan is pretty much yellow. JWST is an infrared telescope, so it doesn’t show the visible spectrum we see. So the colors mean something, but they don’t mean, “what humans would see when looking at it with their eyes.” There are many visible spectrum images of Titan from other sources, however.
Titan is the only object other than Earth where liquid hydrocarbon lakes and seas have actually been found (by Cassini) in its polar regions – in abundance in the north polar region and at least one of approximately 20,000 km2, called Ontario Lacus, on its south pole. Just recently, there have also been long-standing methane lakes, or puddles, in Titan’s “tropics” discovered.
Titan is far enough out that focal depth doesn't really factor into it; as far as JWST is concerned it is at infinity. Which does raise the question of why it's so blurry, though