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