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