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