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)(19,24)(20,22)(21,25)(23,27)(26,31)(28,32)(29,30) involution — undirected(1,3,6,5)(2,7,4,8)(10,14)(11,16)(17,19,23,31)(18,24,27,26)(20,29,21,28)(22,30,25,32)(1,2,6,4)(3,7,5,8)(9,11)(10,12)(13,16)(14,15)(17,20,23,21)(18,25,27,22)(19,28,31,29)(24,30,26,32)(1,2,6,4)(3,8,5,7)(9,11)(10,12)(13,16)(14,15)(17,21,23,20)(18,25,27,22)(19,29,31,28)(24,30,26,32)(1,4,6,2)(3,7,5,8)(9,12)(10,11)(13,15)(14,16)(17,19)(18,26)(20,28)(21,29)(22,30)(23,31)(24,27)(25,32)(1,5,6,3)(2,7,4,8)(17,22,23,25)(18,20,27,21)(19,30,31,32)(24,29,26,28)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.