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