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