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