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