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