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