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