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