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