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