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