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