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