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