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