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