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