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