Hi Ganesh and welcome to the Q&A Forum!
Can you explain a bit more about what you mean when you ask how to get the exact color? What types of problems are you having, if any?
Have you changed any camera settings?
Make sure to lock focus and exposure correctly. For most photos, you should have the camera set to Auto White Balance. The camera also has photo effects to adjust the color in the My Colors menu: Vivid, Neutral and Custom. You can adjust the contrast, sharpness and color saturation to your personal taste under Custom.
I owned the S2, which is a very similar camera. I've written about it in my blog and there may be some tips there that you'll find useful.
http://www.digicamhelp.com/topics/camera-logs/canon-s2-is/If you have a link to some of your photos online, we may be able to give more specific help.