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