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