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