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