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