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