The drawing is a bit inconsistance the Aux switch which is just one of the four contacts on a typical contactor, is drawn as a switch contact (--o_o--), it should look like the contactor contacts (i.e. a bit like a capacitor on an electronic circuit diagram -| |- )

N.B. a normally closed contact looks like a variable cap i.e. a cap with a line drawn at an angle through it --|/|--)