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