I'm looking at some data on the camera here:
http://www.dpreview.com/reviews/specs/Canon/canon_sd200.asp
First off, try shooting at ISO 50 or 100. Beyond that, older compact cameras will typically lose it quality-wise. This may require a slow shutter speed, which will require a tripod or something stationary. Use the self timer so pushing the shutter button doesn't move the camera.
Looks like there's 5 settings for white balance. That's what affects the colors. See if there's an indoor setting or a flash setting. I think setting it manually will require an 18% gray card or some such. That will get you the most accurate colors.
Set the image quality to the max, Super-fine.
Set the metering to evaluative, that should balance the overall exposure. If the image needs to be lighter or darker, use the EV (exposure compensation) to adjust it.
Good luck!