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