Try the point3d function:
sage: L = [ (1, 1, 1), (1, 5, 7), (8.8, 0, 3),  (7.5, 1.91, 11.8), (0, 0, 0) ]

See the documentation for point3d by typing point3d? at the command line. See the text3d function if you want to add text labels to your points.