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