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