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