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)(19,25,27,23)(21,24,28,29)(26,31,32,30)(1,3,4,7)(2,5,6,8)(9,10,13,11)(12,14,16,15)(18,22)(19,26)(21,29)(23,31)(24,28)(25,30)(27,32)(2,6)(5,8)(9,11,13,10)(12,14,16,15)(17,19,20,27)(18,23,22,25)(21,30,28,31)(24,32,29,26)(9,12,13,16)(10,14,11,15)(19,27)(23,25)(26,32)(30,31)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.