There isn't really a standard layout for 360 sticks, and pretty much every game you would want to use the stick for lets you remap the buttons.
The Hori sticks have a weird layout of:
B X Y
A L R
I'm not sure of the SF IV stick layout on 360, but it is 8 button, so regardless of placement the main buttons are all there.
I'm pretty sure it is as follows though, which would be similar the the PS3 version:
X Y L Lb
A B R Rb
I rearranged the buttons in my DOA 4 Hori stick (Not a job for people afraid of a soldering iron) to the more standard layout of:
X Y L
A B R
And I made a custom stick with an 8 button layout:
L X Y Lb
R A B Rb