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