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