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