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