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