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