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