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