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I believe he's holding on to the inner axes. Like an axel through the middle of the ball. Probably some form of rope. Like so:
(-i-)
The guys stands up, holding onto a rope of some sort which attaches to each of the smaller circles on each side of the wheel. This forms an axel which gives it an upright position.
If you look closely at the ball itself, it's segmented as a beach ball would be. Where normally a beachball has segments of different color with perhaps a white circle on the "top" and "bottom". In this case, the "top" and "bottom" are really the left and right side.
This keeps it level, him holding onto the ropes making up the axes, and gives him a "foreward" and "backwards" so he can move. He can likely also lean towards one of the "sides" to stear it sort of in that direction.
Since it is fairly smooth outside, I doubt it goes much of anywhere fast.
I'd venture a guess that he gets into the ball at one of the two "sides". They probably expand, or rather close, like a "Glad bag(TM)" would.
Quzah.
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