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