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