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