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