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