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