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