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