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