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