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)(17,18,23,26,22,24,21,31)(19,20,25,30,27,29,32,28)(3,8)(5,7)(9,10)(11,16)(12,15)(13,14)(18,24)(19,27)(25,32)(26,31) involution — undirected(1,3,4,8)(2,5,6,7)(9,11,13,12)(10,15,14,16)(17,19)(18,20)(21,32)(22,27)(23,25)(24,29)(26,30)(28,31)(2,6)(5,7)(9,11,13,12)(10,15,14,16)(17,20,21,28,22,29,23,30)(18,25,31,19,24,32,26,27)(9,12,13,11)(10,15,14,16)(17,21,22,23)(18,26,24,31)(19,25,27,32)(20,28,29,30)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.