You can swap places of the genetive with what it describes, resulting in slightly different wording:
Das Auto des Mannes
Des Mannes Auto
The latter is more unusual and has a more elevated or posh touch to me.
The genitive usually comes right after what it refers to. The reverse is true when you look at names in the genitive. They usually go before the object they describe:
Roberts Auto (mind: no article!)
or if the name goes 2nd it's usually not in genitive any longer:
Das Auto von Robert
Das Auto Roberts
is a very uncommon word order, yet it will be understood.