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