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