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