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