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