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