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