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