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