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