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