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