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