Assuming that the game is outside during the daytime.
The S80 has a lot of ''shooting modes'' available, but none are suited to assuring good actions shots.
Switch the camera to Shutter priority AE mode.
That mode lets you set the shutter speed and the camera will set the aperture to assure a correctly exposed photo.
Start with a shutter speed of about 1/250th of a second. That should be sufficient to freeze the action and prevent motion blur.
Check the results after a few shots and if you encounter any unwanted motion blur, set the shutter speed one step faster.
Some people like to see a little motion blur of the hands or legs .... it gives the appearance of movement.
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When shooting soccer with a digital camera it is difficult to follow the action if you are using the LCD to compose the shot. If you find you are missing a lot of shots, start using the viewfinder to compose your shots.
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What is the best settings for action shots such as a kids soccer game? How can I get the fastest shutter speed and picture quality?

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