Wow, we don't hear questions involving 3 phase 240 very often. It's a wild- or high-leg delta, then, with the orange coloring and all that?
Table 210-21(b)(3) is what you're looking for. It indicates which combinations of receptacles and breakers are allowed. It also confirms that multiple receptacles are generally allowed. For circuits having two or more receptacles:
The present use of 20 A receptacles on a 30 A circuit is non-compliant.
So far as keeping all of these on the same breaker, the maximum cord-and-plug connected load is 80% of the circuit breaker limit, which would be 16 A after you swap that 30 A breaker down to 20 A to match the connected receptacles. You'll have to sum the load of the connected devices and find out whether it exceeds 16 A. If so, multiple circuits are required.