Open your menu manager, Select (tick) the Main Menu, then on right top area select copy
Give the copied menu a name i tested this with module menu. Give the new MODULE a name I called this one SIDE
save changes
Open module manager , select SIDE ( or what you called the module) set it to publish at left or right and then you have your duplicated main menu in a module position. Colours? That would probably mean a lot of individual css manipulation if you want a different colour for each item? and beyond the scope of my abilities LOL. However it’s not hard to change the whole menu colour as a complete thing. But I gather that’s not your request
Blessings Shannon