Have a look at the link below for some ideas. With 8 nics I would do something like this. This scenario will assume that all VLAN(s) required are allowed on all eight uplinks. If not then you will need to create more than one vDS (vSphere Distributed Switch). Also do not worry about placing management on the vDS as it is very low risk these days. Also this is assumed that your uplinks are 1GB each. NFS does not allow for MPIO and even though you can do LACP on your switch and within the vDS port group for your NFS traffic it can over complicate it. However without knowing the number of workloads and potential IO requirements it may justify going down the LACP route for your NFS traffic.
dvSwitch-NIOC enabled
dvPortGroup-MGMT (dvUplink1, dvUplink2, dvUplink3, dvUplink4, dvUplink5, dvUplink6) - All uplinks active and Route based on Physical NIC Load
dvPortGroup-vMotion-1 Active - (dvUplink2) -- Standby (dvUplink1, dvUplink3, dvUplink4, dvUplink5, dvUplink6)
dvPortGroup-vMotion-2 Active - (dvUplink3) -- Standby (dvUplink1, dvUplink2, dvUplink4, dvUplink5, dvUplink6)
dvPortGroup-Guests Active - (dvUplink1, dvUplink2, dvUplink3, dvUplink4, dvUplink5, dvUplink6) - All uplinks active and Route based on Physical NIC Load
dvPortGroup-NFS Active - (dvUplink7) -- Standby (dvUplink8) without LACP
dvPortGroup-NFS Active - (dvUplink5, dvUplink6, dvUplink7, dvUplink8) - Route Based on IP Hash (move dvUplink5 and dvUplink6 from other port groups to unused)
Obviously there are many other ways to lay all of this out so have fun for sure.
http://everythingshouldbevirtual.com/vsphere-5-1-network-designs