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