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