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