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