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