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