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