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