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