There isn't a readily available simple diagram that universally shows this. The best way to visually understand it is to find a picture of the engine and number the cylinders (usually cast into the engine block itself) then follow the 1-3-5-2-4-6 sequence. Remember that cylinder #1 is typically at the front of the engine (closest to the radiator).
You might find diagrams in a repair manual specific to that year and engine. Online searching using the exact engine code might also yield a diagram. However, the firing order itself is the most crucial piece of information.
