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