It doesn't really matter where each switch or overload is in the series (stop) or parallel (start) part actually is as long as the serial switches are electrically in front of the parallel switches. They still work the same.
If any serial switch opens (bottom row on my picture) the contactor drops. As long as that stop/overload switch is open, none of the start switches are powered so you can't start it again.
The aux switch is just used to hold the contactor in, unless any of the other stop or overloads opens. The start switches are momentary contact and are only there to start the sequence bypassing the side switch until the contactor is energized.
