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