Audio Jack for FTDI TTL-232R-[3V3]-AJ:
(view from behind onto the contacts)

      _______
     /       \
    /         \
   |           |
   |  1     3  |  1 = TX, 3 = RX
   |           |
    \    2    /   2 = GND
     \_______/

Used colors:
1 = white (TX)
3 = black (RX)
2 = thick black (GND)
- = red (Vcc)

Note that TX and RX may have to be switched depending on the used audio jack.
So test connection before soldering.