This is version 1.2 for cats 1.3.0, cats-effect 1.0.0, and cats-mtl 0.2.3.
This is an OmniGraffle 7 diagram of the Cats typeclass hierarchy, shareable under the CC-BY-SA 4.0 license.
The .pdf export, suitable for framing or tattoo design, is probably what you want.
The .svg export below is embiggenable with a gentle click.
