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