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