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