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