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)(11,16)(12,14)(13,15)(17,18,22,26,21,23,31,28)(19,27,29,30,25,24,32,20)(2,5)(3,7)(18,23)(20,30)(24,27)(26,28) involution — undirected(9,11,13,12)(10,14,15,16)(17,19,21,25)(18,24,23,27)(20,28,30,26)(22,29,31,32)(1,3,4,7)(2,6,5,8)(9,12,13,11)(10,14,15,16)(19,25)(20,30)(24,27)(29,32)(2,5)(6,8)(17,20,22,27,21,30,31,24)(18,25,26,32,23,19,28,29)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.