Just sit down with a cold drink and pick a lead. Measure resistance to every other lead and write them down. Then go to the next lead and measure to all but the first, write them down.
What will happen is you will find some are wired together, have a resistance between each other. These are one winding. Once you have windings identified, the largest resistances are end to end, any others are taps on that winding. Say you have four leads that have resistances of 2 ohms, 4 ohms and 6 ohms. The 2 and 4 are intermediate taps and the end to end is the 6 ohm reading. (The readings will never be that even)