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