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