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