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