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