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