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