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