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