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