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