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