As i know, for standard joints, it is not possible to graphically display the direction of the vector of forces and moments during animation in the postprocessor.
But...You can try using the "bushing" element instead. Simulate one or a joint by adjusting the stiffness (large values to limit movement and almost zero for degrees of freedom). In fact, the same values should be obtained, and at the same time, the mapping of forces can be specified in the "properties of the bushing". I hope I understood you correctly and could help.