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