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