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