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