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