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