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