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