The soulknife's supernatural ability free draw says
At 5th level, a soulknife becomes able to materialize his mind blade as a free action instead of a move action. He can make only one attempt to materialize the mind blade per round, however.
The skill Iaijutsu Focus says
If you attack a flat-footed opponent immediately after drawing a melee weapon, you can deal extra damage, based on the result of an Iaijutsu Focus check. (Oriental Adventures 58)
Actions in Combat implies that drawing a weapon means not generating it spontaneously but taking the weapon out of something.
Drawing a weapon so that you can use it in combat, or putting it away so that you have a free hand, requires a move action. This action also applies to weapon-like objects carried in easy reach, such as wands.
So to draw a weapon, the weapon's removed from its container, even if that's the built-in sheath of the gnome quickrazor (Races of Stone 154).
...But a soulknife can make a fair case about allowing the skill Iaijutsu Focus to work with his mind blade
Because "[t]he moment [the soulknife] relinquishes his grip on his blade, it dissipates," the mind blade's created in the soulknife's hand, so if the soulknife tucks his hand into a sack or whatever, he can create the mind blade within the container. Then as a move action, during a normal move if the soulknife has a base attack bonus of at least +1, or as a free action using the feat Quick Draw, he can withdraw the mind blade, therefore possibly benefiting from the cross-class ranks he's invested into the skill Iaijutsu Focus.