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