Richmond is right.
The "points" of a graphic are a list of numbers, they have no color property.
To colorize points/vertices of a graphic you can use (at most) foreColor, backColor, markerColor and markerFillColor *
of the graphic*.
All vertices of a graphic become by that the *same* display (produced by the above color settings).
For different colorized points of graphics simply use different graphics.
There are a lot of sample stacks in this forum and in "Sample Stacks" that show how to do this.
[For example 'Mr. Polygony' is combined by several lines of different colors
http://forums.livecode.com/viewtopic.ph ... 16#p114016
or the points in the graphics here
http://forums.livecode.com/viewtopic.ph ... 07#p113907
are the points of two graphics (a red colored and a yellow colored one)].