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