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