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