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