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