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