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For N non interacting spinless particles in a volume, we have 3N degrees of freedom and we can divide the phase space into 6N dimensional cells of volume h raised to power 3N.

And each cell represents a state of the system. That means the system can be in any of those cells.

How can a cell be visualized? Is it combination of many volumes of the individual particles where the particles might be in? Fixing one particle in its one of the individual states (i.e., in one cell when the system is only one spinless particle) and all the possible combination of the other particles in their cells, does this represent one cell for the N particle system?

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the cell can be visualized if we consider the heisenberg uncertainity principle dx*dp=h. so with a system in a 6N dimensional phase space the fundamental volume that can be associated with a single microstate is (h)^3N. because within this volume the various states will be non distinct.

see statistical mechanics R.K.Pathria Third Edition ch-2 pg-35

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