what would it look like on a planet on a galaxy on the edge of the universe?

An equivalent question is: "What does it look like from a city on the edge of Earth?" This isn't an exact analogy, because it is possible to travel everywhere on Earth, all in a relatively short span of time, and that is not possible in the Universe.

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So, go outside at night and look around. To the best of our knowledge, on the largest scale, that is what it looks like from every other galaxy in the Universe.

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No matter where you are in the universe, there would be galaxies on every side of you. There is no "center" or "edge" of the universe. Something like there is no "center" or "edge" for the SURFACE of a billiard ball.

you are assuming that there is indeed an edge to the universe. This is parallel to the idea that the medieval people had when they believed that they could sail off the edge of the Earth. It is more likely that space-time is curved in such a way that any "edge" does not in fact exist just as there is no "edge" on a globe. I have written about such things extensively in my book, including logical reasons why the planets should be hollow, including the Moon - which fact , incidentally is believed by many scientists at NASA.. ... read my book.

The universe is isotropic, there is no point in it very different from any other, on the large scale. It has no center no edges, it is finite but unbounded.

There is no center and there is no edge.