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