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)(17,18)(19,24)(20,25)(21,26)(22,23)(27,28)(29,31)(30,32)(1,3,5,8)(2,6,4,7)(17,18)(19,24)(20,25)(21,26)(22,23)(27,28)(29,31)(30,32)(10,14)(11,16)(18,23)(19,26)(25,31)(27,32) involution — undirected(1,2,5,4)(3,6,8,7)(9,11,13,16)(10,15,14,12)(17,19,22,26)(18,24,23,21)(20,27,29,32)(25,28,31,30)(9,12,13,15)(10,16,14,11)(17,20)(18,25)(19,27)(21,30)(22,29)(23,31)(24,28)(26,32)(1,4,5,2)(3,7,8,6)(17,21,22,24)(18,26,23,19)(20,28,29,30)(25,27,31,32)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.