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