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