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