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