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