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