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