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