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