brew install graphviz

dot -Tpng statemachine.dot -o statemachine.png

brew install plantuml

plantuml statemachine.uml.dot
plantuml -tsvg statemachine.uml.dot

Possible formats

    -teps               To generate images using EPS format
    -thtml              To generate HTML file for class diagram
    -tlatex:nopreamble  To generate images using LaTeX/Tikz format without preamble
    -tlatex             To generate images using LaTeX/Tikz format
    -tpdf               To generate images using PDF format
    -tpng               To generate images using PNG format (default)
    -tscxml             To generate SCXML file for state diagram
    -tsvg               To generate images using SVG format
    -ttxt               To generate images with ASCII art
    -tutxt              To generate images with ASCII art using Unicode characters
    -tvdx               To generate images using VDX format
    -txmi               To generate XMI file for class diagram

plantuml statemachine.scxml