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