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