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