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