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