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)(11,12)(13,14)(15,16)(17,18,21,23)(19,20,24,22)(27,31)(30,32)(1,3)(2,7)(4,6)(5,8)(10,14)(12,15)(17,19)(18,22)(20,23)(21,24)(26,29)(30,32) involution — undirected(2,8)(3,4)(9,11,13,16)(10,12,14,15)(17,20,21,22)(18,19,23,24)(25,26)(27,30)(28,29)(31,32)(1,4,6,3)(2,5,8,7)(9,11)(10,15)(12,14)(13,16)(17,20)(18,19)(21,22)(23,24)(25,27,28,31)(26,30,29,32)(1,5)(2,3)(4,8)(6,7)(9,12,13,15)(10,11,14,16)(17,18)(19,20)(21,23)(22,24)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.