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