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