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