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