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