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