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