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