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