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