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