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