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)(19,20)(24,30)(25,32)(29,31) involution — undirected(2,6)(7,8)(9,11)(10,13)(12,16)(14,15)(17,18,22,27)(19,24,20,30)(21,28,23,26)(25,29,32,31)(1,3,5,4)(2,7,6,8)(10,14)(11,16)(17,19,22,20)(18,24,27,30)(21,31,23,29)(25,26,32,28)(10,14)(13,15)(17,20,22,19)(18,25,27,32)(21,31,23,29)(24,26,30,28)(1,4,5,3)(2,7,6,8)(10,14)(13,15)(17,21,22,23)(18,26,27,28)(19,29,20,31)(24,25,30,32)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.