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