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