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