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