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