How does Steinbeck present hierarchy in society in Of Mice and Men?

This is a great question. 

First, as the previous answer says, white men are at the top of the social ladder.  That said, there is a hierarchy here as well.  At the top is the boss.  He is a landowner and pretty much owns everything that the men have.  That he is at the top is also confirmed in the fact that Curley is begrudgingly given respect, simply because he is the son of the...

This is a great question. 

First, as the previous answer says, white men are at the top of the social ladder.  That said, there is a hierarchy here as well.  At the top is the boss.  He is a landowner and pretty much owns everything that the men have.  That he is at the top is also confirmed in the fact that Curley is begrudgingly given respect, simply because he is the son of the owner. 

From here, Slim comes second.  His standing does not come from his possessions or wealth but from his abilities and character.  All the men respect him.  Here is what the text says:

There was a gravity in his manner and a quiet so profound that all talk stopped when he spoke. His authority was so great that his word was taken on any subject, be it politics or love.

After this, the other white workers come next - Carlson and Candy.  Lennie and George also fit in here, even if they are put lower because they are new. Below them comes Crooks.  He is the lone black man on the ranch, and he lives a solitary life. At times the men pick on him, such as when they made him fight another man for their amusement.