3d-plot of points, but assigning each point with a specific color, how?

[Constellation Athome]

hi,

I want to plot points with 3d coordinates like this
http://twitpic.com/8dj7r4 but I need to assign them with different colors,
so that I can have a different color for each "cluster".
how do I do that? and perhaps with bigger points, so that they are better
visible ;).

thanks in advance, Andreas
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