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