Hi Ben
The cloth covered hose can be cleaned with a cloth dipped in a solution of woolite and water, rung out almost dry.
The original paint is hammertone finish, the best way to paint would be a very light spray standing from about 12 inches away. Let the paint rain down as a light mist. This will preserve the 'wrinkles', which is the way it was originally.
The casing is aluminum on yours - later ones would use a combination of magnesium and aluminum forming a compound Interstate Engineering referred to as "magnalite".