If the x-values are equally spaced, just use a waveform graph. Merge all the single traced into a 2D array using "built array".
At this point, it would be good to look at a few examples shipped with LabVIEW. Go to help...find examples. In the Example browser, go to "Fundamentals...Graph and Charts" I would recommend you look at "Waveform Graph.vi" (especially the wiring for "(Y) Multi Plot 1" on that diagram). If your x-values are not spaced equally, look at XY-Graph.vi in the same section. Just follow the example.
