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