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