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