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