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