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