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