Is there a mandatory pattern for stator windings in 3 phase induction motors?
The diagram is drawn as it is for convenience and simplicity. The orientation of the north and south poles are given for a specific moment in time. You must carefully study the written description and any other diagrams that are included where you found the diagram. Once you clearly understand the basic process as it is described, you can move on to more detailed presentations that describe actual winding schemes for motors with 2 and more poles. It may help to find the basic presentation presented in different ways. Other presentations are likely to be similar, but there may be enough difference to add to your understanding.