import arcpy

workspace = r'C:gdb_dir'
workspaces = arcpy.ListFiles('*.gdb')        # list of files to process

for workspace in workspaces:
    name_prefix = workspace[0:-4]
    current_MXD = name_prefix + '.mxd'       # this file will already exist

    dataSrc = r'C:name_prefixSample.gdbDetailFeatures'
    fieldX = 'NEAR_X'
    fieldY = 'NEAR_Y'
    graph_template = r'C:tempScatterGraphTemplate.tee'
    out_graph_name = "ScatterTest"
    out_graph = r'c:graphs' + name_prefix + '.grf'   # How to insert this into mxd?

    graph = arcpy.Graph()

    graph.addSeriesScatterPlot(dataSrc, fieldY, fieldX)
    graph.graphAxis[0].title = "Near Y"
    graph.graphAxis[2].title = "Near X"
    graph.graphPropsGeneral.title = "Test of Flake Property Graph"
    arcpy.MakeGraph_management(graph_template, graph, out_graph_name)

    arcpy.SaveGraph_management(out_graph_name, out_graph, "MAINTAIN_ASPECT_RATIO", 600, 375)

import arcpy
mxd = arcpy.mapping.MapDocument(r"C:ProjectProject.mxd")
for elm in arcpy.mapping.ListLayoutElements(mxd, "PICTURE_ELEMENT"):
    if elm.name == "GRAPH":
        elm.sourceImage = r"C:ProjectDataMyGraph.jpg"
mxd.save()
del mxd