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