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