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