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