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