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