Note: This tutorial is great for a simple prop in the background. But it doesn't stand up in accuracy. Upon reviewing the tutorial further and receiving comments this is indeed not a completely accurate representation of a soccer/football. For a video demonstrating how to create an accurate version see here.
Find the tutorial here.
The change I'd make to the tutorial is to not extrude each pentagon individually. But rather when you select the pentagons to set the material this is when you should extrude the polygons. Just make sure to extrude by region and in place. And then with all the polygons still selected use Alt-S to translate/scale the polygons along their normals. And remember if you happen to deselect the pentagons you can reselect them by selecting the material assigned to them in the Links and Materials Panel. You do have to extrude each of the hexagon's individually to get the right effect.