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