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