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