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)(17,18,22,20)(19,26,29,24)(21,31,23,25)(27,30,32,28)(2,5)(6,7)(9,10)(11,15)(12,16)(13,14)(17,19)(18,24)(20,26)(21,30)(22,29)(23,28)(25,32)(27,31) involution — undirected(10,14)(15,16)(17,18,22,20)(19,24,29,26)(21,31,23,25)(27,28,32,30)(9,11,13,12)(10,15,14,16)(17,20,22,18)(19,27,29,32)(21,31,23,25)(24,28,26,30)(1,3,4,8)(2,6,5,7)(9,12,13,11)(10,16,14,15)(17,21,22,23)(18,25,20,31)(19,28,29,30)(24,27,26,32)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.