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