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