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