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