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