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