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