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