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