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