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