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)(19,24)(20,21)(22,25)(23,26)(27,31)(28,29)(30,32) involution — undirected(1,2)(3,4)(5,6)(7,8)(9,10)(11,12)(13,14)(15,16)(17,18,23,26)(19,24,20,21)(22,25,30,32)(27,31,28,29)(2,6)(4,7)(10,14)(12,15)(17,19,23,20)(18,24,26,21)(22,28,30,27)(25,29,32,31)(2,6)(3,8)(9,11,13,16)(10,12,14,15)(17,20,23,19)(18,24,26,21)(22,28,30,27)(25,31,32,29)(1,3)(2,7)(4,6)(5,8)(9,11)(10,15)(12,14)(13,16)(17,21,23,24)(18,20,26,19)(22,29,30,31)(25,28,32,27)(1,4,5,7)(2,3,6,8)(9,12,13,15)(10,11,14,16)(17,22,23,30)(18,25,26,32)(19,27,20,28)(21,29,24,31)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.