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