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