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