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