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