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