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