One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(10,11)(14,15)(17,18,20,22)(19,23,26,30)(21,24,27,28)(25,29,32,31)(1,3,4,7)(2,5,6,8)(9,10,13,11)(12,14,16,15)(18,22)(19,25)(21,28)(23,31)(24,27)(26,32)(29,30)(2,6)(5,8)(9,11,13,10)(12,14,16,15)(17,19,20,26)(18,23,22,30)(21,29,27,31)(24,32,28,25)(9,12,13,16)(10,14,11,15)(19,26)(23,30)(25,32)(29,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.