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