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