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