This graph needs a handful of colors.
vertices: 142
faces: 72
edges: 216
genus: 2
characteristic polynomial:
(-1 + x) (1 + x) (76312930726164198564 - 6342391150683936840x - ... - 215x138 + x140)
dual's characteristic polynomial:
(-6 + x) (2 + x) (-2243909606400 - 55768207537152x - ... - 188x68 + 4x69 + x70)
chromatic number: 5
lattice group:
A(432)