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