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