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