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