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Distant rider moves can use the same symbol as slider moves; only the first leap would use the jump symbol, where for sliders the adjacent square would use the same symbol as the distant targets.

OK, so a leap arrow on the first jump, and then dots on any others. Right?

Also, for a hopper one would not mark the square behind the mount as a jump; the jump symbol must be reserved for direct leaps from the square of origin. That reaching the square involves a jump is already obvious from the geometry; what the symbols should convey is whether the presence of another piece not shown in the diagram between the target and the moving piece would block the move or not.

It may take me a while to wrap my brain around how to apply that in Musketeer's Board Painter. If I understand you right, I'd use a leap/capture symbol on the square of the captured piece, and not mark the destination square at all. (Personally I'd still want to put a line-arrow from the starting square to get the information across to newbies.) Or would I use a dot on the landing square?

Note that the amount of information that one can display in a static move diagram is rather limited, and for unusual moves can easily  be misinterpreted. (E.g. imagine a 'stuttering rider', which alternately moves outward like D and then pulls back like W; it would reach the same squares as a Rook.

Yeah, for something like that, I definitely would use line-arrows, and of different colors for forward and back, along with an explanatory text. I recently put together a diagram for a combined Rose and Nightrider, which I appropriately call the Nightmare -- it's as likely to be that for both players, in different ways, as putting together the diagram was for me.