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