There is no "right" way to do this. The person doing the talk may not be on the search committee or have anything to do with the hiring process. My advice would be to look at the Psych Wiki for the places already listing jobs (and there are a LOT for the end of July this year) and if you run into someone from one of those departments, ask some additional questions about any "unspecified" parts of the job ad--are they looking for a particular research area, or for someone to cover specific courses? But listen more than you ask, and don't use it as an opportunity to sell yourself too hard--that's a serious turnoff for job applicants (same applies to asking "what can I do to make sure my application stands out"--DO NOT ask this!). Express genuine interest, ask questions that can help you gauge whether it is a place you might be happy, thank them and move on.
There are a LOT of pieces to hiring a TT person (search committees, budgets, Deans offices) and one person at APA is not going to know how all of those shake out, so really don't worry much about talking to the right people because we may not even know who those people are yet. My department is going to be hiring and we have no idea who will be on the search committee yet!