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