The shape is actually correct — when the MOSFET symbol is drawn without a body connection, the arrow is drawn on the source connection and faces the opposite direction. If you'd like more information or to see what I'm talking about, the wikipedia page on MOSFETs has a section on the circuit symbols. Here's a link:

https://en.wikipedia.org/wiki/MOSFET#Circuit_symbols

Also the body diode should be added to the shape