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