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)(11,14)(12,16)(13,15)(17,18)(19,26)(20,21)(22,23)(24,27)(25,31)(28,29)(30,32)(3,7)(5,8)(9,10)(11,14)(12,16)(13,15)(18,23)(21,25)(24,26)(29,32) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,11)(10,12)(13,16)(14,15)(19,27)(24,26)(28,30)(29,32) involution — undirected(9,11,13,16)(10,14,15,12)(17,19,22,27)(18,24,23,26)(20,30,31,28)(21,29,25,32)(1,3)(2,5)(4,7)(6,8)(9,11)(10,12)(13,16)(14,15)(17,20)(18,25)(19,28)(21,23)(22,31)(24,29)(26,32)(27,30) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,12)(10,11)(13,14)(15,16)(17,21,22,25)(18,20,23,31)(19,29,27,32)(24,30,26,28)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.