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