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