No, the light cone does not depend on the frame in which it is viewed.
The light cone is a collection of events that are lightlike-separated from $P$. This collection of points is the same in all reference frames because in special relativity the interval is invariant.
If you swept out a light cone from $P$ by having a source at $P$ emit a spherical electromagnetic wave and noting where the wavefront was at future times, you would get the same result in all reference frames - that the edge of the wavefront was a sphere centered on $P$ with radius $ct$, with $t$ the time since the pulse was emitted. This is true even if source at $P$ is moving at the time the wavefront is emitted.