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