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