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