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