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