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