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