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