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