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)(19,22)(20,21)(23,25)(24,27)(26,31)(28,29)(30,32)(1,3,5,8)(2,6,7,4)(11,15)(13,16)(17,19,23,27)(18,24,25,22)(20,30,26,28)(21,29,31,32)(1,3)(2,6)(4,7)(5,8)(9,10)(11,13)(12,14)(15,16)(18,25)(20,26)(22,24)(28,30) involution — undirected(2,7)(3,8)(17,20)(18,21)(19,28)(22,29)(23,26)(24,32)(25,31)(27,30) involution — undirected(1,3)(2,4)(5,8)(6,7)(9,11,12,15)(10,13,14,16)(17,21)(18,26)(19,29)(20,25)(22,30)(23,31)(24,28)(27,32)(1,4)(2,3)(5,6)(7,8)(9,10)(11,13)(12,14)(15,16)(17,22,23,24)(18,27,25,19)(20,29,26,32)(21,30,31,28)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.