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