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