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