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