And it doesn't look like

graphcool@beta

is on NPM yet. Edit: now it is but with an error

syscall chmod
npm ERR! enoent ENOENT: no such file or directory, chmod '/usr/local/lib/node_modules/graphcool/dist/index.js'
npm ERR! enoent This is related to npm not being able to find a file.

Apologies, you can now install it using

npm install -g graphcool@beta