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