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