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