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