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