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