One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,14)(12,15)(13,16)(17,18,21,23)(19,24,28,30)(20,25,27,31)(22,26,29,32)(1,3,4,8)(2,5,6,7)(9,11,13,12)(10,14,16,15)(18,23)(19,27)(20,28)(22,29)(24,25)(30,31)(9,11,13,12)(10,15,16,14)(17,19)(18,24)(20,22)(21,28)(23,30)(25,26)(27,29)(31,32)(2,6)(5,7)(18,23)(24,30)(25,31)(26,32) involution — undirected(3,8)(5,7)(9,12,13,11)(10,15,16,14)(17,20,21,27)(18,25,23,31)(19,22,28,29)(24,26,30,32)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.