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